<template>
  <div ref="wrapper" class="list">
    <div>
      <div class="area">
        <div class="title border-topbottom">
          当前城市
        </div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ $store.state.city }}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">
          热门城市
        </div>
        <div class="button-list">
          <div v-for="item of hot"
               :key="item.id"
               class="button-wrapper"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{ item.name }}</div>
          </div>
        </div>
      </div>
      <div
          v-for="(item,key) of cities"
          :key="key"
          :ref="elem => elems[key] = elem"
          class="area"
      >
        <div class="title border-topbottom">
          {{ key }}
        </div>
        <div class="item-list">
          <div v-for="innerItem of item"
               :key="innerItem.id"
               class="item border-bottom"
               @click="handleCityClick(innerItem.name)"
          >
            {{ innerItem.name }}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {useStore} from 'vuex'
import {useRouter} from 'vue-router'
import {onMounted, ref, watch} from "vue";

export default {
  name: 'List',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  setup(props) {
    const store = useStore()
    const currentCity = store.state.city
    const router = useRouter()
    const elems = ref({})
    let scroll = null
    const wrapper = ref(null)

    // const currentCity=store.state.currentCity
    function handleCityClick(city) {
      store.commit('changeCity', city)
      router.push('/')
    }

    watch(() => props.letter, (letter, prevletter) => {
      if (letter && scroll) {
        const e = elems.value[letter]
        scroll.scrollToElement(e)
      }
    })
    onMounted(() => {
      scroll = new Bscroll(wrapper.value, {click: true})
    })
    return {currentCity, elems, wrapper, handleCityClick}
  }
}
</script>

<style lang="stylus" scoped>
.border-topbottom
  &:before
    border-color #ccc

  &:after
    border-color #ccc

.border-bottom
  &:before
    border-color #ccc

.list
  overflow hidden
  position absolute
  top 2.1rem
  left 0
  right 0
  bottom 0

  .title
    line-height .54rem
    background #eee
    padding-left .2rem
    color #666
    font-size .26rem

  .button-list
    overflow hidden
    padding .1rem .6rem .1rem .1rem

    .button-wrapper
      float left
      width 33%

      .button
        padding .1rem 0
        text-align center
        margin .1rem
        border .01rem #ccc solid
        border-radius .1rem

  .item-list
    .item
      line-height .74rem
      color #666
      padding-left .2rem
</style>
